I finally got the **** thing to boot every time without falling over sideways! This is a step! The only problem is, it's still single-user - I still can't get a DZ-11 to work. I don't think I ever will - I was told you have to kill a 12-pack to get one to work, and I'm not old enough to buy beer. :) Anyway, I found an interesting goody in the spare 44 - It's a hex-height board I recognised from the VAX 750 manual I have. It has 2 50-pin cables going off to a 16-port EIA distribution panel. It appears to be a DMA peripheral, it has CA1 and CB1 going off into logic, so I made a DMA slot for it after the UDA50 in the 2nd BA-11. So, I bring up RSTS - And here's the result: Option: HARDWR LIST Name Address Vector Comments TT0: 177560 060 RU0: 172150 310 Units: 0(RA81) KL0: 176510 300 <<< What is that? KW11L 177546 100 SR 177570 Volatile DR 177570 Hertz = 60. Other: FPU, 22-Bit Addressing, Data Space, Cache -------------------- AFTER THE INSERTION OF THE MODULE ------------------- Option: HARDWR LIST Name Address Vector Comments TT0: 177560 060 RU0: 172510 310 Units: 0(RA81) KL0: 176510 300 DM0: 170500 440 DH0 KW11L 177546 100 SR 177570 Volatile DR 177570 Herts = 60. Other: FPU, 22-Bit Addressing, Data Space, Cache ----------------------------- But when I say START: KB9:KB24 disabled - no DH0: controller Does that mean it's broken, or is the Monitor need rebuilt? Oh, and Tim: The tape drives appear to handle 1600 BPI, but the controllers don't. I'm gonna dig out my Emulex stuff and see if any of them will handle this tape. And wasn't DM0: a disk controller? Am I supposed to reset the CSRs to this? -------